EntityFramework 5 getting null value when using Include() method

I use Code first EntityFramework 5 in my project. I came across a strange problem. My code is as follow:

 public IQueryable<Company> Companies
    {
        get
        {
            return context.Companies.Include("BankAccounts").Include("CompanyContacts").Include("MyClients").Include("MyCompanies");
        }
    }

and method for calling some Companies:

public IQueryable<Company> GetMyCompaniesByUserId(Guid userId)
    {
        var obj = context.Companies.Include("BankAccounts");
        //Thread.Sleep(1000);
        var companeies = from c in obj
                         from myc in context.MyCompanies
                         where c.IsDelete == false && myc.UserId == userId && c.CompanyId == myc.CompanyId
                         select c;
        return companeies;

    }

Problem is that When I call GetMyCompaniesByUserId() method the bankaccounts is null, but when I debug this code step by step it works. I don't have any idea about problem. Please, help me. Thank in advance.